I work in a hospital catering section constantly checking this stuff. People suffer reactions for specific nuts, but get placed on ‘all nuts’ by us as a precaution, because the food manufacturers won’t specify which nut they shipped us.
They use this blanket ‘main contain traces of nuts’. In the processing factory, theres every opportunity for cross-contamination.
As for ‘all fruits’, I’ve marked off people with sensitives to fructose, the sugar in most fruits(not all though).
I’ve been pondering a similar ELI5 question regarding nut allergies. So many of the things we call nuts aren’t true nuts, eg peanuts, cashews, almonds but they all seem to grouped together with regards to allergies. Do people with nut allergies have to be careful to avoid things like fragments of peach pit? What exactly is going on and why do allergies seem to have a a concept of the colloquial term “nut”.
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